There are arguments to both options.

• Single Currency - usually simpler for players to understand
• Multiple Currencies - allows more flexibility to in future optimizations

For a single player action game I don't think you need more than two. Three of four currencies is something that is usually reserved for resource management games where you actually gain different types of supplies and currencies as part of the game play.

There are arguments to both options.

• Single Currency - usually simpler for players to understand
• Multiple Currencies - allows more flexibility to in future optimizations

For a single player action game I don't think you need more than two. Three of four currencies is something that is usually reserved for resource management games where you actually gain different types of supplies and currencies as part of the game play.

A standard two currency model for an action game is having a 'soft currency' and a 'hard currency':

• Soft Currency - Coins that a player can collect or otherwise obtain during game play
• Hard Currency - Only available to users who pay real cash

The game would normally allow users to exchange hard currency to soft currency but not the other way around. To get more users to pay some virtual goods will require a user to pay with hard currency or with amounts of soft currency that are hard to collect with game play.